US10810942B2 - Organic light emitting display device configured to vary power supply voltage based on display brightness and ambient temperature - Google Patents

Organic light emitting display device configured to vary power supply voltage based on display brightness and ambient temperature Download PDF

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Publication number
US10810942B2
US10810942B2 US16/205,512 US201816205512A US10810942B2 US 10810942 B2 US10810942 B2 US 10810942B2 US 201816205512 A US201816205512 A US 201816205512A US 10810942 B2 US10810942 B2 US 10810942B2
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power supply
supply voltage
light emitting
organic light
voltage
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US20190304372A1 (en
Inventor
Si Beak PYO
Choon Yul Oh
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Samsung Display Co Ltd
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Samsung Display Co Ltd
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Assigned to SAMSUNG DISPLAY CO., LTD. reassignment SAMSUNG DISPLAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OH, CHOON YUL, PYO, SI BEAK
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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Definitions

  • Exemplary embodiments generally relate to display devices, and more particularly, to organic light emitting display devices capable of controlling a magnitude of a power supply voltage.
  • An organic light emitting display device includes a plurality of pixels for displaying an image using organic light emitting diodes.
  • Each of the organic light emitting diodes typically includes an anode, a cathode, and an organic light emitting layer between the anode and the cathode.
  • the organic light emitting diode emits light when a voltage greater than a threshold voltage of the organic light emitting layer is applied between the anode and the cathode.
  • one or more pixels among the plurality of pixels may have different light emitting efficiency, response speed, and the like, depending on the color of emission light.
  • the pixel characteristics of an individual pixel including the organic light emitting diode may vary depending on ambient temperature and brightness change. Due to such deviations between pixels, visibility defects, such as color blurring and color shift, can occur during frame to frame image conversion.
  • Some exemplary embodiments provide an organic light emitting display device capable of controlling voltage levels of power supply voltages applied to pixels based on a brightness change and/or an ambient temperature change.
  • an organic light emitting display device includes a display panel, a display panel driver, and a power supply.
  • the display panel includes pixels.
  • Each of the pixels includes an organic light emitting diode configured to emit light in an emission period based on a first power supply voltage and a second power supply voltage.
  • the display panel driver is configured to apply a scan signal, an emission control signal, and a data signal to the pixels.
  • the power supply is configured to: generate the first power supply voltage, the second power supply voltage, and a third power supply voltage applied to the pixels in a non-emission period; and adjust a voltage level of the second power supply voltage and a voltage level of the third power supply voltage based on an ambient temperature and a brightness of the display panel.
  • the power supply may include a second power supply voltage determiner, a delta voltage determiner, and a third power supply voltage determiner.
  • the second power supply voltage determiner may be configured to determine the voltage level of the second power supply voltage based on the ambient temperature and the brightness.
  • the delta voltage determiner may be configured to determine a delta voltage that is an offset of the second power supply voltage based on the ambient temperature and the brightness.
  • the third power supply voltage determiner may be configured to determine the voltage level of the third power supply voltage based on the second power supply voltage and the delta voltage.
  • the third power supply voltage may be determined as a sum of the second power supply voltage and the delta voltage.
  • the delta voltage may decrease as the brightness increases.
  • the delta voltage may decrease as the ambient temperature increases.
  • the third power supply voltage may be provided to an anode of the organic light emitting diode during the non-emission period to initialize an anode voltage of the organic light emitting diode.
  • each of the pixels may further include a driving transistor coupled between a first node and a second node.
  • the driving transistor may include a gate electrode coupled to a third node.
  • the power supply may be configured to generate a fourth power supply voltage applied to the gate electrode of the driving transistor.
  • the fourth power supply voltage may have a constant value regardless of the ambient temperature and the brightness.
  • a (j, k) pixel arranged in a j-th column and a k-th row of the pixels may further include first to sixth transistors and a storage capacitor.
  • the first transistor may be coupled between a j-th data line and the first node.
  • the first transistor may include a gate electrode configured to receive a k-th scan signal.
  • the second transistor may be coupled between the second node and the third node.
  • the second transistor may include a gate electrode configured to receive the k-th scan signal.
  • the third transistor may be coupled between a conductive line configured to transmit the fourth power supply voltage and the third node.
  • the third transistor may include a gate electrode configured to receive a (k ⁇ 1)-th scan signal.
  • the fourth transistor may be coupled between a power supply line configured to transmit the first power supply voltage and the first node.
  • the fourth transistor may include a gate electrode configured to receive a k-th emission control signal.
  • the fifth transistor may be coupled between the second node and an anode of the organic light emitting diode.
  • the fifth transistor may include a gate electrode configured to receive the k-th emission control signal.
  • the sixth transistor may be coupled between a conductive line configured to transmit the third power supply voltage and the anode of the organic light emitting diode.
  • the sixth transistor may include a gate electrode configured to receive the k-th scan signal.
  • the storage capacitor may be coupled between the power supply line and the third node.
  • the organic light emitting display device may further include a brightness calculator and a temperature sensor.
  • the brightness calculator may be configured to determine the brightness of the display panel based on image data of one frame.
  • the temperature sensor may be configured to detect the ambient temperature of the display panel.
  • the third power supply voltage may decrease to predetermined values as the brightness increases.
  • the third power supply voltage may increase to predetermined values as the ambient temperature increases.
  • a delta voltage which is a voltage difference between the second power supply voltage and the third power supply voltage, may increase as the brightness decreases.
  • the delta voltage may increase as the ambient temperature decreases.
  • a change rate of the second power supply voltage and a change rate of the third power supply voltage may be different from each other in accordance with at least one of a change of the ambient temperature and a change of the brightness.
  • an organic light emitting display device includes a display panel, a display panel driver, and a power supply.
  • the display panel includes pixels.
  • Each of the pixels includes a driving transistor and an organic light emitting diode.
  • the driving transistor includes a gate electrode.
  • the organic light emitting diode is configured to emit light in an emission period based on a first power supply voltage and a second power supply voltage.
  • the display panel driver is configured to apply a scan signal, an emission control signal, and a data signal to the pixels.
  • the power supply is configured to: generate the first power supply voltage, the second power supply voltage, a third power supply voltage applied to the pixels in a non-emission period, and a fourth power supply voltage applied to the gate electrode of the driving transistor in the non-emission period; and adjust a delta voltage based on an ambient temperature and a brightness of the display panel.
  • the delta voltage is a voltage difference between the second power supply voltage and the third power supply voltage.
  • the delta voltage may decrease as the brightness increases.
  • the delta voltage may decrease as the ambient temperature increases.
  • the fourth power supply voltage may have a constant value regardless of the ambient temperature and the brightness.
  • a change rate of the second power supply voltage and a change rate of the third power supply voltage may be different from each other in accordance with at least one of a change of the ambient temperature and a change of the brightness.
  • FIG. 1 is a block diagram of an organic light emitting display device according to some exemplary embodiments.
  • FIG. 2 is a circuit diagram illustrating an example of a pixel included in the organic light emitting display device of FIG. 1 according to some exemplary embodiments.
  • FIG. 3 is a block diagram illustrating an example of a power supply included in the organic light emitting display device of FIG. 1 according to some exemplary embodiments.
  • FIG. 4 is a diagram illustrating an example of power supply voltages output from the power supply of FIG. 3 according to some exemplary embodiments.
  • FIGS. 5A and 5B are graphs illustrating examples of a delta voltage determined by the power supply of FIG. 3 according to some exemplary embodiments.
  • FIGS. 6A and 6B are graphs illustrating examples of a second power supply voltage and a third power supply voltage determined by the power supply of FIG. 3 according to some exemplary embodiments.
  • FIGS. 7A and 7B are graphs illustrating examples of a second power supply voltage and a third power supply voltage determined by the power supply of FIG. 3 according to some exemplary embodiments.
  • FIGS. 8A and 8B are graphs illustrating examples of bias of organic light emitting diodes included in the organic light emitting display device of FIG. 1 according to some exemplary embodiments.
  • the illustrated exemplary embodiments are to be understood as providing exemplary features of varying detail of some exemplary embodiments. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions, aspects, etc. (hereinafter individually or collectively referred to as an “element” or “elements”), of the various illustrations may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts.
  • “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be construed as X only, Y only, Z only, or any combination of two or more of X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ.
  • the term “and/or” includes any and all combinations of one or more of the associated listed items.
  • Spatially relative terms such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), and the like, may be used herein for descriptive purposes, and, thereby, to describe one element's relationship to another element(s) as illustrated in the drawings.
  • Spatially relative terms are intended to encompass different orientations of an apparatus in use, operation, and/or manufacture in addition to the orientation depicted in the drawings. For example, if the apparatus in the drawings is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features.
  • the exemplary term “below” can encompass both an orientation of above and below.
  • the apparatus may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and, as such, the spatially relative descriptors used herein interpreted accordingly.
  • each block, unit, and/or module may be implemented by dedicated hardware, or as a combination of dedicated hardware to perform some functions and a processor (e.g., one or more programmed microprocessors and associated circuitry) to perform other functions.
  • a processor e.g., one or more programmed microprocessors and associated circuitry
  • each block, unit, and/or module of some exemplary embodiments may be physically separated into two or more interacting and discrete blocks, units, and/or modules without departing from the inventive concepts.
  • the blocks, units, and/or modules of some exemplary embodiments may be physically combined into more complex blocks, units, and/or modules without departing from the inventive concepts
  • LCDs liquid crystal displays
  • ELDs inorganic electroluminescent displays
  • PDs plasma displays
  • FEDs field emission displays
  • EPDs electrophoretic displays
  • EWDs electrowetting displays
  • FIG. 1 is a block diagram of an organic light emitting display device according to some exemplary embodiments.
  • the organic light emitting display device 1000 may include a display panel 100 , a display panel driver 200 , and a power supply 300 .
  • the organic light emitting display device 1000 may further include a brightness calculator 500 and a temperature (or temp) sensor 400 .
  • the organic light emitting display device 1000 may be a flat display device, a flexible display device, a curved display device, a foldable display device, a bendable display device, and/or the like. Further, the organic light emitting display device 1000 may be applied to a transparent display device, a head-mounted display device, a wearable display device, a single-sided display device, a dual-sided display device, and/or the like.
  • the display panel 100 may include a plurality of scan lines SL 1 to SLn, a plurality of emission control lines EL 1 to ELn, a plurality of data lines DL 1 to DLm, and a plurality of pixels 10 connected to the scan lines SL 1 to SLn, the emission control lines EL 1 to ELn, and the data lines DL 1 to DLm, respectively, where “n” and “m” are integers greater than one (1). In various exemplary embodiments, “n” and “m” may be equal to one another or different from one another.
  • each of the pixels 10 may include a driving transistor and a plurality of switching transistors.
  • Each of the pixels 10 may include an organic light emitting diode that emits light in an emission period based on a first power supply voltage ELVDD and a second power supply voltage ELVSS in an emission period.
  • the display panel driver 200 may provide a scan signal, an emission control signal, and a data signal to the pixels 10 .
  • the display panel driver 200 may include a scan driver 220 for supplying the scan signal, an emission driver 240 for supplying the emission control signal, a data driver 260 for supplying the data signal, and a timing controller 280 for controlling the scan driver 220 , the emission driver 240 , and the data driver 260 .
  • the scan driver 220 , the emission driver 240 , the data driver 260 , and the timing controller 280 may be implemented as one or more integrated circuits (ICs); however, exemplary embodiments are not limited thereto.
  • the scan driver 220 may provide the scan signal to the scan lines SL 1 to SLn based on a scan start signal SFLM. In some exemplary embodiments, the scan driver 220 may simultaneously provide the scan signal (e.g., the scan signals having an active level or a turn-on level) to all of the pixels 10 , or may sequentially provide the scan signal to the display panel 100 through the scan lines SL 1 to SLn, such as in a row-by-row fashion.
  • the scan driver 220 may simultaneously provide the scan signal (e.g., the scan signals having an active level or a turn-on level) to all of the pixels 10 , or may sequentially provide the scan signal to the display panel 100 through the scan lines SL 1 to SLn, such as in a row-by-row fashion.
  • the emission driver 240 may provide the emission control signal to the emission control lines EL 1 to ELn based on an emission control start signal EFLM. In some exemplary embodiments, the emission driver 240 may simultaneously provide the light emission control signals to all of the pixels 10 , or may sequentially provide the light emission control signal to the display panel 100 through the emission control lines EL 1 to ELn.
  • the data driver 260 may provide the data signal (e.g., data voltages) to the data lines DL 1 to DLm based on a data control signal DCS and image data RGB provided from the timing controller 280 .
  • the data driver 260 may convert the image data RGB of a digital format into data signals of an analog format, and may output the data signals to the pixels 10 through the data lines DL 1 to DLm.
  • the timing controller 280 may receive an RGB image signal, a vertical synchronizing signal, a horizontal synchronizing signal, a main clock signal, and a data enable signal from an external graphic controller or any other suitable source.
  • the timing controller 280 may generate the scan start signal SFLM, the emission control start signal EFLM, the data control signal DCS, and the image data RGB corresponding to the RGB image signal. Further, timing controller 280 may generate a control signal CON for controlling an operation of the power supply 300 .
  • the power supply 300 may generate the first power supply voltage ELVDD, the second power supply voltage ELVSS, and a third power supply voltage VINT 1 based on the control signal CON.
  • the first power supply voltage ELVDD may be a driving voltage supplied to one electrode of the driving transistor of the pixel 10
  • the second power supply voltage ELVSS may be a common voltage supplied to a cathode of the organic light emitting diode.
  • the third power supply voltage VINT 1 may be supplied to the pixels 10 during a non-emission period.
  • the third power supply voltage VINT 1 may be an initialization voltage for initializing (or resetting) an anode voltage of the organic light emitting diode to a predetermined value. Therefore, a predetermined bias may be applied to the organic light emitting diode by applying the third power supply voltage VINT 1 and the second power supply voltage ELVSS to both ends of the organic light emitting diode during the non-emission period.
  • the non-emission period may correspond to a period in which the organic light emitting diode does not emit light because the emission control signal is not applied.
  • the power supply 300 may further generate a fourth power supply voltage VINT 2 and supply the fourth power supply voltage VINT 2 to the pixels 10 .
  • the fourth power supply voltage VINT 2 may be provided to a gate electrode of the driving transistor to initialize a gate voltage of the driving transistor.
  • the power supply 300 may control a voltage level of the second power supply voltage ELVSS and a voltage level of the third power supply voltage VINT 1 based on an ambient temperature TEMP of the organic light emitting display device 1000 and a display brightness DBV of the display panel 100 (e.g., display brightness value). Therefore, a forward bias can be set to a value (e.g., an optimal value) for the organic light emitting diode according to a temperature, a temperature change, a brightness, and/or a brightness change.
  • the fourth power supply voltage VINT 2 may have a constant value regardless of the brightness DBV, the change of the brightness DBV, the ambient temperature TEMP, and/or the change of the ambient temperature TEMP.
  • the fourth power supply voltage VINT 2 When the fourth power supply voltage VINT 2 varies, a driving current flowing through the driving transistor may change unexpectedly. Thereby, there is a possibility that an emission characteristic (e.g., an optical characteristic) of the pixel 10 is changed not to match the data voltage. Accordingly, the four power supply voltages VINT 2 may have the constant value regardless of the brightness DBV and the ambient temperature TEMP and/or changes in the brightness DBV and the ambient temperature TEMP. For descriptive convenience, exemplary embodiments will, hereinafter, be described in association with changes in at least one of the brightness DBV and the ambient temperature TEMP.
  • a conventional power supply adjusts the voltage level of the second power supply voltage ELVSS in response to the brightness DBV change of the display panel 100 .
  • the brightness DBV changes from black to white or when a low grayscale image changes to a high grayscale image
  • issues with color blurring and/or color shifting due to differences in driving currents and response speeds of, for instance, red, green, and blue pixels can be addressed.
  • the conventional power supply controls a magnitude of the third power supply voltage VINT 1 according to the change of the second power supply voltage ELVSS, thereby applying a stable forward bias to the organic light emitting diode in response to the change in brightness DBV.
  • the conventional power supply voltage control method does not consider the change in characteristics of the pixels 10 according to the change in ambient temperature TEMP, and thus, issues with the color shift due to temperature changes and/or increases in brightness (luminance) of low grayscale images (e.g., a black image) occur.
  • the response speed can be increased and the color shift can be eliminated.
  • the brightness of the low grayscale (or black brightness) may increase, which can be create an issue in implementing the low grayscale image.
  • a voltage difference between the third power supply voltage VINT 1 and the second power supply voltage ELVSS may become larger than a threshold voltage of the organic light emitting diode so that the black brightness (brightness of the black image) may be increased.
  • a reverse bias may be unintentionally applied to the organic light emitting diode at a predetermined temperature and brightness condition.
  • the response speed deviation between, for instance, the red, green, and blue pixels becomes large, and display failure, such as a color shift, may be expressed.
  • the power supply 300 may control the second power supply voltage ELVSS and the third power supply voltage VINT 1 differently depending on the brightness DBV and the ambient temperature TEMP. It is possible to apply an optimal (or maximum) forward bias to the organic light emitting diode while eliminating the brightness rise of the low grayscale image (e.g., realize a stable black image brightness). Therefore, the color blurring and color shift due to a sudden change in brightness DBV may be eliminated without consuming a large amount of power.
  • the second power supply voltage ELVSS and the third power supply voltage VINT 1 may be adjusted such that the voltage difference between the second power supply voltage ELVSS and the third power supply voltage VINT 1 is constant in accordance with the brightness DBV and the ambient temperature TEMP change.
  • the configuration and operation of the power supply 300 for controlling the voltage level of the second power supply voltage ELVSS and the third power supply voltage VINT 1 will be described in detail with reference to FIGS. 3 to 8B .
  • the functions of the power supply 300 and the display driver 200 are arbitrarily divided for convenience of explanation. However, configurations and operations are not limited thereto.
  • the power supply 300 may be included in the display panel driver 200 , or a part of the power supply 300 may be included in the display panel driver 200 .
  • the temperature sensor 400 may detect the ambient temperature TEMP of the display panel 100 .
  • the brightness calculator 500 may calculate (or determine) the brightness DBV of the display panel 100 based on the image data RGB of one frame.
  • the ambient temperature TEMP and the brightness DBV generated by the temperature sensor 400 and the brightness calculator 500 may be provided to the power supply 300 .
  • the ambient temperature TEMP and the brightness DBV may also be provided to the timing controller 280 .
  • FIG. 2 is a circuit diagram illustrating an example of a pixel included in the organic light emitting display device of FIG. 1 according to some exemplary embodiments.
  • the pixel 10 may include a driving transistor TD, first to sixth transistors T 1 to T 6 , an organic light emitting diode EL, and a storage capacitor CST.
  • the pixel 10 may be a (j, k) pixel arranged in a j-th column and a k-th row, where “j” is an integer greater than zero (0) and less than or equal to “m,” and “k” is an integer greater than one (1) and less than or equal to “n.”
  • the driving transistor TD may be coupled between a first node N 1 and a second node N 2 .
  • the driving transistor TD may include a gate electrode coupled to a third node N 3 .
  • the first transistor T 1 may be a scan transistor for transmitting the data voltage DATA(j) to the pixel 10 by scanning a k-th scan signal SCAN(k).
  • the first transistor T 1 may be coupled between a j-th data line and the first node N 1 .
  • the first transistor T 1 may include a gate electrode for receiving the k-th scan signal SCAN(k).
  • the second transistor T 2 may serve to write the data voltage DATA(j) to the driving transistor TD and to perform threshold voltage compensation.
  • the second transistor T 2 may be coupled between the second node N 2 and the third node N 3 .
  • the second transistor T 2 may include a gate electrode for receiving the k-th scan signal SCAN(k).
  • the driving transistor TD When the first transistor T 1 and the second transistor T 2 are turned on by the k-th scan signal SCAN(k), the driving transistor TD may be diode-connected and the threshold voltage compensation for the driving transistor TD may be performed.
  • the third transistor T 3 may be coupled between the third node N 3 and a conductive line transmitting the fourth power supply voltage VINT 2 .
  • the third transistor T 3 may include a gate electrode for receiving a (k ⁇ 1)-th scan signal SCAN(k ⁇ 1).
  • the fourth power supply voltage VINT 2 may be supplied to the gate electrode of the driving transistor TD.
  • the fourth power supply voltage VINT 2 may be an initialization voltage for initializing the gate voltage of the driving transistor TD.
  • the gate voltage of the driving transistor TD may be initialized to the fourth power supply voltage VINT 2 .
  • the fourth power supply voltage VINT 2 may have a constant value regardless of changes in ambient temperature TEMP and brightness DBV of the display panel 100 .
  • the fourth power supply voltage VINT 2 and the third power supply voltage VINT 1 may be independently controlled.
  • the fourth power supply voltage VINT 2 may be set to a voltage lower than the lowest voltage of the data voltage.
  • the fourth transistor T 4 may be coupled between the first node N 1 and a power supply line for transmitting the first power supply voltage ELVDD.
  • the fourth transistor T 4 may include a gate electrode for receiving a k-th emission control signal EM(k).
  • the fifth transistor T 5 may be coupled between the second node N 2 and an anode N 4 of the organic light emitting diode EL.
  • the fifth transistor T 5 may include a gate electrode for receiving the k-th emission control signal EM(k).
  • the sixth transistor T 6 may be coupled between the conductive line for transmitting the third power supply voltage VINT 1 and the anode N 4 of the organic light emitting diode EL.
  • the sixth transistor T 6 may include a gate electrode for receiving the k-th scan signal SCAN(k).
  • the third power supply voltage VINT 1 may be supplied to the anode N 4 of the organic light emitting diode EL.
  • the third power supply voltage VINT 1 may be an initialization voltage for initializing the anode voltage of the organic light emitting diode EL.
  • the anode voltage of the organic light emitting diode EL may be initialized to the third power supply voltage VINT 1 (or a difference between the third power supply voltage VINT 1 and the second power supply voltage ELVSS).
  • the third power supply voltage VINT 1 may vary depending on the ambient temperature TEMP and brightness DBV of the display panel 100 .
  • a change rate of the voltage level of the third power supply voltage VINT 1 may be different from a change rate of the second power supply voltage ELVSS. Therefore, the magnitude of the forward bias applied to the organic light emitting diode EL may be changed according to the change in ambient temperature TEMP and/or brightness DBV of the display panel 100 .
  • the storage capacitor CST may be coupled between the power supply line transmitting the first power supply voltage ELVDD and the third node N 3 .
  • the cathode of the organic light emitting diode EL may be connected to the power supply line transmitting the second power supply voltage ELVSS.
  • the second power supply voltage ELVSS may vary depending on the change in ambient temperature TEMP and/or the change in brightness DBV of the display panel 100 .
  • FIG. 3 is a block diagram illustrating an example of a power supply included in the organic light emitting display device of FIG. 1 according to some exemplary embodiments.
  • FIG. 4 is a diagram illustrating an example of power supply voltages output from the power supply of FIG. 3 according to some exemplary embodiments.
  • the power supply 300 may include a second power supply voltage determiner (e.g., ELVSS determiner) 320 , a delta voltage determiner (e.g. V_DELTA determiner) 340 , and a third power supply voltage determiner (e.g., VINT 1 determiner) 360 .
  • the power supply 300 may further generate the first power supply voltage ELVDD and the fourth power supply voltage VINT 2 and apply the first power supply voltage ELVDD and the fourth power supply voltage VINT 2 to the display panel 100 .
  • the power supply 300 may receive data including the ambient temperature TEMP and the brightness DBV information to output the second power supply voltage ELVSS and the third power supply voltage VINT 1 .
  • the second power supply voltage determiner 320 may determine a voltage level of the second power supply voltage ELVSS based on the ambient temperature TEMP and the brightness DBV.
  • the adjustment of the second power supply voltage ELVSS can reduce the power consumption and improve the color shift in response to the image change such as an abrupt brightness change.
  • the second power supply voltage ELVSS may have a range of about ⁇ 5V to about ⁇ 2V depending on the ambient temperature TEMP and the brightness DBV.
  • the ambient temperatures TEMP are provided below the column headers for the second power supply voltage ELVSS, a delta voltage V_D, the third power supply voltage VINT 1 , and a forward bias EL_bias of the organic light emitting diode EL.
  • the second power supply voltage determiner 320 may selectively output the voltage level of the second power supply voltage ELVSS in response to the ambient temperature TEMP and the brightness DBV.
  • the second power supply voltage ELVSS may have a voltage level that is less than a middle brightness range between about 100 nit (e.g., 100 cd/m 2 ) and about 300 nit (e.g., 300 cd/m 2 ) to emit a high brightness image in a high brightness range of about 300 nit or more.
  • the second power supply voltage ELVSS at an ultralow brightness range of about 15 nit or less or a black image brightness may be set to be less than the voltage level in the middle brightness range. Accordingly, color blur (color shift) due to a rapid increase in brightness (or a rise in grayscale) from a black image to a white image may be improved (such as minimized).
  • the second power supply voltage ELVSS may be set to decrease as the ambient temperature TEMP decreases.
  • the performance of the pixel e.g., response speed, etc.
  • the forward bias EL_bias of the organic light emitting diode EL may be set to be increased as the ambient temperature TEMP decreases.
  • the adjustment of the second power supply voltage ELVSS is not limited thereto.
  • the second power supply voltage ELVSS may have a constant value regardless of the change of the ambient temperature TEMP.
  • the second power supply voltage determiner 320 may adjust the second power supply voltage ELVSS in accordance with the operation mode of the organic light emitting display device 1000 .
  • an amount of change in the second power supply voltage ELVSS according to the change in the brightness DBV and/or the ambient temperature TEMP in a low power driving mode may be less than the amount of change in the second power voltage ELVSS in a normal driving mode.
  • the low power driving mode may be a mode for limiting the brightness (or the maximum brightness) of the display panel 100 to a predetermined brightness or lower.
  • the low power driving mode may include a night mode, an always on display mode, and/or the like.
  • the delta voltage determiner 340 may determine a delta voltage V_D, which is an offset to the second power supply voltage ELVSS based on the ambient temperature TEMP and the brightness DBV.
  • the delta voltage V_D may be a value for determining the voltage level of the third power supply voltage VINT 1 .
  • the third power supply voltage VINT 1 may be determined by a difference between the delta voltage V_D and the second power supply voltage ELVSS.
  • the delta voltage V_D may be in a range of about 0.5V to about 1.5V depending on the ambient temperature TEMP and the brightness DBV.
  • the delta voltage V_D may decrease as the brightness DBV increases. Accordingly, at the same ambient temperature condition, the magnitude of the forward bias EL_bias applied to the organic light emitting diode EL may be reduced according to the increase of the brightness DBV.
  • the forward bias EL_bias of the organic light emitting diode EL at the low brightness (and/or low grayscale) having a larger black margin may be greater than at the high brightness condition so that response characteristics, color blurring, and/or the like of the pixels 10 may be improved. As illustrated in FIG. 4 , the forward bias EL_bias of the organic light emitting diode EL may also be in the range of about 0.5V to about 1.5V depending on the delta voltage V_D.
  • the delta voltage V_D may decrease as the ambient temperature TEMP increases. Accordingly, at the same brightness condition, the magnitude of the forward bias EL_bias applied to the organic light emitting diode EL can be reduced according to the increase of the ambient temperature TEMP. That is, the delta voltage V_D and the magnitude of the forward bias EL_bias applied to the organic light emitting diode EL may be selected in consideration of the response characteristic of the organic light emitting diode EL that changes according to the change of the ambient temperature TEMP.
  • the change rate of the delta voltage V_D and the change rate of the second power supply voltage ELVSS may be different from each other.
  • the third power supply voltage determiner 360 may determine the third power supply voltage VINT 1 based on the second power supply voltage ELVSS and the delta voltage V_D.
  • the third power supply voltage VINT 1 may be calculated as the sum of the second power supply voltage ELVSS and the delta voltage V_D.
  • the third power supply voltage determiner 360 may include an adder that receives the second power supply voltage ELVSS and the delta voltage V_D and outputs the third power supply voltage VINT 1 .
  • the second power supply voltage ELVSS may be set to about ⁇ 3.1 V and the delta voltage V_D may be set to about 0.5 V when the display panel 100 emits light of about 100 nit in an environment of 25° C.
  • the third power supply voltage VINT 1 may be set to about ⁇ 2.6V by the sum of the second power supply voltage ELVSS and the delta voltage V_D.
  • the third power supply voltage VINT 1 may be in a range of about ⁇ 4.5V to about ⁇ 2V depending on the ambient temperature TEMP and the brightness DBV.
  • the third power supply voltage VINT 1 may be determined by the delta voltage V_D, e.g., a predetermined bias of the organic light emitting diode EL. Therefore, the change rate of the third power supply voltage VINT 1 due to the change of the ambient temperature TEMP and/or the brightness DBV may be different from the change rate of the second power supply voltage ELVSS.
  • the third power supply voltage VINT 1 may decrease to predetermined values as the brightness DBV increases. Further, in some exemplary embodiments, at the same brightness condition, the third power supply voltage VINT 1 may increase to predetermined values as the ambient temperature TEMP increases. However, these are merely examples, and such a change in the third power supply voltage VINT 1 may be applied only to a specific brightness condition or a specific temperature condition. For example, in the low brightness condition, the third power supply voltage VINT 1 may decrease according to the increase of the ambient temperature TEMP in a range from about ⁇ 20° C. to about 0° C., and then may increase according to the increase of the ambient temperature TEMP in a range from about 0° C. to about 20° C.
  • the power supply 300 may individually adjust the second power supply voltage ELVSS and the third power supply voltage VINT 1 so that a larger forward bias EL_bias is applied to the organic light emitting diode EL at a relatively low ambient temperature TEMP condition and/or a relatively low brightness DBV condition. Therefore, an optimum bias may be applied to the organic light emitting diode EL in response to the brightness DBV and ambient temperature TEMP changes of the display panel 100 without unnecessary power consumption. Thus, the color blur and color shift by the response speed deviation of the pixels 10 at the time of display image change may be improved.
  • the forward bias EL_bias less than the threshold voltage of the organic light emitting diode EL may be stably applied to the organic light emitting diode EL at the low brightness DBV and the low grayscale so that defective display, such as black image brightness rise, may be improved.
  • FIGS. 5A and 5B are graphs illustrating examples of a delta voltage determined by the power supply of FIG. 3 according to some exemplary embodiments.
  • the delta voltage V_D may change in response to the brightness DBV change and the ambient temperature TEMP change.
  • the delta voltage V_D may correspond to a voltage difference between the second power supply voltage ELVSS supplied to the cathode of the organic light emitting diode EL and the third power supply voltage VINT 1 supplied to the anode of the organic light emitting diode EL during the non-emission period.
  • the delta voltage V_D may correspond to a bias voltage EL_bias applied to the organic light emitting diode EL.
  • the delta voltage V_D may vary in response to the ambient temperature TEMP change.
  • the voltage level of the delta voltage V_D may be set to decrease with a constant interval as the ambient temperature TEMP increases. That is, as the ambient temperature TEMP is lowered, the larger forward bias EL_bias may applied to the organic light emitting diode EL. This is because as the ambient temperature TEMP is lowered, the driving ability and the response speed of the organic light emitting diode EL composed of organic materials may be lowered.
  • the range of the ambient temperature TEMP may be set in a range of about ⁇ 20° C. to about 30° C. However, this is merely an example, and a temperature range exceeding 30° C. may be added.
  • the delta voltage V_D may be determined to be about 0.8V.
  • the delta voltage V_D may be decreased in steps as the ambient temperature TEMP increases. Since this is merely an example, the shape and rate of decrease of the delta voltage V_D are not limited thereto.
  • the decreasing graph of the delta voltage V_D with increasing ambient temperature TEMP may have a linear shape or a non-linear shape with an exponential function.
  • the delta voltage V_D for the relatively low brightness may be set to be greater than the delta voltage V_D for the relatively high brightness (or high grayscale) under the same ambient temperature TEMP condition. Since the black margin in the low brightness range is larger than the black margin in the high brightness (or luminance) range, the forward bias EL_bias for the low brightness range may be set to be greater than the forward bias EL_bias for the high brightness range. These settings may improve visual defects, such as color blur, color shift, and/or the like.
  • the delta voltage V_D may be set to be decreased to preset values as the brightness (or grayscale) increases.
  • the degree of change of the delta voltage V_D in the low brightness range may be set to be larger than the degree of change of the delta voltage V_D in the middle brightness range and the high brightness range.
  • an optimal forward bias EL_bias may be applied to the organic light emitting diode EL in accordance with the brightness DBV and temperature TEMP changes of the display panel 100 without unnecessary power consumption, and the visual defects, such as the color blur and color shift, due to the response speed deviation of the pixel 10 may be improved.
  • FIGS. 6A and 6B are graphs illustrating examples of a second power supply voltage and a third power supply voltage determined by the power supply of FIG. 3 according to some exemplary embodiments.
  • the second power supply voltage ELVSS and the third power supply voltage VINT 1 may change in response to the ambient temperature TEMP change at the same brightness DBV condition.
  • the second power supply voltage ELVSS may be the common voltage supplied to the cathode of the organic light emitting diode EL for light emission.
  • the third power supply voltage VINT 1 may be a voltage for initializing the anode voltage of the organic light emitting diode EL before light emission.
  • the second power supply voltage ELVSS may maintain a constant value regardless of the change in the ambient temperature TEMP at the condition of the maximum luminance (e.g., 750 nit display brightness).
  • the third power supply voltage VINT 1 may be lowered as the ambient temperature TEMP increases.
  • the third power supply voltage VINT 1 may be determined by the magnitude of the delta voltage V_D.
  • the difference between the second power supply voltage ELVSS and the third power supply voltage VINT 1 may correspond to the magnitude of the delta voltage V_D and the forward bias EL_bias of the organic light emitting diode EL. That is, in the case of maximum brightness emission, the forward bias EL_bias of the organic light emitting diode EL may be decreased in steps as the ambient temperature TEMP increases.
  • the second power supply voltage ELVSS may change once at a predetermined ambient temperature in the low brightness condition (for example, about 4 nit display brightness).
  • the second power supply voltage ELVSS may be set at about ⁇ 3.6V at about 25° C. or higher, and may be set at about ⁇ 3.8V at a temperature lower than 2° C.
  • the third power supply voltage VINT 1 may be expressed as a graph in which the voltage level decreases with an increase in the ambient temperature TEMP and then increases as the ambient temperature TEMP changes.
  • the third power supply voltage VINT 1 may be set corresponding to the delta voltage V_D (i.e., the bias voltage EL_bias of the organic light emitting diode EL) that is decreased with the increase in ambient temperature TEMP.
  • the voltage levels of the second power supply voltage ELVSS and the third power supply voltage VINT 1 may be adjusted at different rates such that a larger forward bias EL_bias is applied to the organic light emitting diode EL as the ambient temperature TEMP decreases.
  • FIGS. 7A and 7B are graphs illustrating examples of a second power supply voltage and a third power supply voltage determined by the power supply of FIG. 3 according to some exemplary embodiments.
  • the second power supply voltage ELVSS and the third power supply voltage VINT 1 may change in response to the ambient temperature TEMP change at the same brightness DBV condition.
  • the voltage level of the second power supply voltage ELVSS may increase with a dense interval in the low brightness range (e.g., in a range of about 0 nit to about 60 nit) at 25° C. condition.
  • the voltage level of the second power supply voltage ELVSS may decrease with a larger interval in the high brightness range (e.g., the brightness of 300 nit or more) at 25° C. condition.
  • the third power supply voltage VINT 1 may be determined by the magnitude of the delta voltage V_D. Since the delta voltage V_D is set to decrease as the brightness increases, the third power supply voltage VINT 1 may change according to the brightness change as shown in FIG. 7A .
  • FIG. 7B shows changes in the second power supply voltage ELVSS, the third power supply voltage VINT 1 , and the magnitude of the forward bias EL_bias (which may be equal to a difference between the second power supply voltage ELVSS and the third power supply voltage VINT 1 ) of the organic light emitting diode EL according to the luminance change at 0° C. condition. Since the voltage changes due to the brightness DBV change are described above, a duplicate description will be omitted.
  • the voltage levels of the second power supply voltage ELVSS and the third power supply voltage VINT 1 may be adjusted at different rates such that a larger forward bias EL_bias is applied to the organic light emitting diode EL as the brightness DBV is lowered.
  • FIGS. 8A and 8B are graphs illustrating examples of bias of organic light emitting diodes included in the organic light emitting display device of FIG. 1 according to some exemplary embodiments.
  • the magnitude of the forward bias EL_bias applied to the organic light emitting diode EL may be adjusted in response to the ambient temperature TEMP change at the same brightness DBV condition.
  • the difference between the second power supply voltage ELVSS and the third power supply voltage VINT 1 in FIGS. 6A and 6B may be expressed by the bias voltage graph of FIG. 8A .
  • the magnitude of the forward bias EL_bias applied to the organic light emitting diode EL may decrease with a predetermined interval as the ambient temperature TEMP increases.
  • the difference between the second power supply voltage ELVSS and the third power supply voltage VINT 1 in FIGS. 7A and 7B may be expressed by the bias voltage graph of FIG. 8B .
  • the magnitude of the forward bias EL_bias applied to the organic light emitting diode EL may decrease with a predetermined interval as the brightness DBV increases.
  • the organic light emitting display device 1000 may individually adjust the second power supply voltage ELVSS and the third power supply voltage VINT 1 in consideration of both the ambient temperature TEMP and the brightness DBV.
  • an optimal forward bias EL_bias may be applied to the organic light emitting diode EL in response to the brightness DBV and ambient temperature TEMP changes of the display panel 100 without unnecessary power consumption, and the visual defects, such as the color blur and color shift, due to the response speed deviation of the pixel 10 may be improved.
  • the forward bias EL_bias less than the threshold voltage of the organic light emitting diode EL may be stably applied to the organic light emitting diode EL at the low brightness and the low grayscale so that defective display, such as the black image brightness rise, may be improved.
  • HMD head-mounted display
  • PDA personal digital assistant
  • PMP portable multimedia player
  • MP3 player a navigation system
  • game console a video phone
  • video phone a billboard

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  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
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US20190304372A1 (en) 2019-10-03
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